Falconi, M., G. Teti, B. Grigolo, C. Cavallo, A. Facchini, and G. Mazzotti. “Ultrastructure Differences During in Vitro Osteogenesis and Chondrogenesis of Bone Marrow Mesenchymal Stem Cells”. Italian Journal of Anatomy and Embryology, vol. 115, no. 1/2, Nov. 2010, p. 64, https://oajournals.fupress.net/index.php/ijae/article/view/4449.